Photozone makes it very clear that the test results cannot be compared across systems......

Great British Landscapes
wrote:

lol. You know that's a joke. Take your fanboy hat off. In terms of sharpness and resolution Nikon's dirt cheap 50mm 1.8G waltzes past Canon much more expensive 1.4 at every single aperture. We'd best not talk about the massive light falloff on the Canon lens either... You got rid of the wrong lens